const CENTER = [30.19637640408235, 120.18273066611019];
let iMap = new Map({
  id: 'mapid',
  center: CENTER,
  zoom: 17,
  tileLayerUrl: 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png'
})

let imageUrl = `${LOCAL_ROOT}static/image/template.jpeg`
let imageBounds = [
  [30.161603, 120.150604],
  [30.224217, 120.228367]
]
L.imageOverlay(imageUrl, imageBounds).addTo(iMap.getMap());

iMap.addMarker(CENTER, {
  url: `${LOCAL_ROOT}static/image/point.jpg`
})